WPF_Practice/PacticeSolution/BindingValidationRuleSample/Converter/ButtonTextBrush.cs

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Data;
using System.Windows.Media;

namespace BindingValidationRuleSample.Converter
{
    [ValueConversion(typeof(int), typeof(Brush))]
    internal class ButtonTextBrush : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (targetType != typeof(Brush))
                return null;

            if (value == null)
                return null;

            int age = int.Parse(value.ToString());
            return ValueColor(age);
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return null;
        }

        private Brush ValueColor(int age)
        {
            if (age >= 10 && age < 20)
                return Brushes.HotPink;

            if (age >= 20 && age < 30)
                return Brushes.DarkOliveGreen;

            return Brushes.MediumPurple;
        }
    }
}